The Synology HD6500 60-Bay Rackmount NAS IS FINALLY COMING!

The Synology HD6500 Rackstation 60-Bay NAS is REAL and it is COMING

Before I crack on and explain why the Synology HD6500 Rackstation NAS is a big deal, indulge me a little and let me tell you a story. I have been following the world of NAS (and data storage in general) for the bulk of my adult life and although I have seen quite a few solutions shown off at trade shows and previews, I have always had this tiny voice in my head that, when I see something particularly groundbreaking, whispers “I wonder if this will ever see release?”. This is because in the last decade alone I can name about 15-20 different NAS solutions that never saw commercial or even industrial release. Synology is as susceptible to this as any other brand – they are a business and as good as a concept is, it has to remain viable, profitable and in market demand. Remember the network gateway SG1000? The 2.5G equipped DS1620xs? They came and went – either changed in architecture or gone altogether. Why am I telling you this? Well, this is largely because I would have SWORN than the 60-Bay HD6400 Rackmount that QNAP previewed to visitors of their global launch events in autumn 2019 was cancelled. Aside from it never being mentioned again in ANY public or event semi-private event in the 2.5+ years since, it was also a fantastically huge solution that was several times to architecture of anything the brand had produced up to that point – heavily gearing towards the hyper-scale. Of course, I was wrong! The newly revealed HD6500 Rackstation NAS server (yes, they changed the name) is actually coming and although this is most certainly a solution that is targetted solely at the enterprise and highest storage tiers, it is certainly quite a wild ride to look at the specifications of the biggest and most powerful NAS that Synology has ever commercially produced. Let’s discuss everything we know.


Much more information has now arrived on the Synology HD6500 Rackstation NAS regarding its design images, connectivity, additional information on the included 2.5″ SATA SSD system drives that are included with the system, PCIe upgrade generations and information on the system software support.

I originally covered the Synology HD6400 60-Bay NAS when it was initially revealed as a concept here. Click to learn about it.

The Synology HD6500 Rackstation NAS – Hardware Specifications

Synology has classed HD6500 Rackstation NAS system with the following description:

Simultaneously large and highly scalable, the HD6500 is the perfect solution for organizations looking to consolidate their warm and cold data storage on a single, highly reliable, and highly capable platform.

There is a lot to unpack in that sentence. Although Synology has already provided some rather hefty 12-Bay, 16-Bay and 24-Bay NAS solutions in their rackstation portfolio that provide a large amount of storage frequency and capacity. However, the bulk of these are designed to be the primary operational platform for a business. They CAN of course be used for cold storage, but unless you are looking at the further end of the rackstation portfolio, they do not provide the sheer weight of years upon years of data (this is particularly true once you factor in multi-site backups being centralized). Now the Synology HD6500 attacks this in two separate ways. First off, the base system arrives with 60 Bays of storage in it’s 4U height chassis. 4U (so 4 slots of a rack cabinet) is simultaneously big and small at the same time. BIG, as most Synology 16/24-Bay rackmounts are 2U or 3U, but also SMALL because you have several times the amount of physical bays available. This is due to the system using an unconventional top-loaded design for each of the 60 SATA/SAS bays. The front of the system that would usually feature the typical bays and trays is instead replaced by a huge ventilation panel that is going to be massively necessary when you factor in the sheer scale of active cooling that this system is going to employ throughout. Below is a photo taken of the original concept design of this NAS from back in 2019.

Now, all that storage is good, but it won’t be much use without some solid and highly proficient hardware inside and outside to take advantage of. The system features a big, BIG CPU offering in the form of TWO Intel Xeon Silver 4210R server processors that are 10-Cores/20-Thread in architecture that arrives with a 2.6Ghz clock speed that can be ramped upto 3.2Ghz when needed This beefy CPU is accompanied by the system arriving with 64GB of ECC RDIMM memory that can be upgraded to a staggering 512GB (yes, half a gig!) of memory. This combined with the system featuring 2 10GbE network ports and four individual PCIe upgrade slots that can each support single/dual port network upgrades all the way upto 25G/40G Fiber allows this system to hit some insane benchmarks of performance. Synology state that the HD6500 can hit 6688MB/s Read and 6662MB/s write, but how this was achieved in drive media and network connections is still TBC.

Then there is the sheer scale of the amount of storage that the Synology HD6500 is able to accommodate. Just in case the 60-Bays of storage available are not enough for you (what is wrong with you?), then the system also can be expanded in its storage with by connecting the new RX6022sas expansion chassis. This is a further 60-Bay externally connected expansion device and the original HD6500 can be connected to FOUR of these expansions at once and allows a 20U single tower stack to accommodate all these and provide a total 300 drives of SAS/SATA storage.

SAS multi-pathing is supported, allowing you to achieve up to twice the performance when deploying multiple expansion units, while Synology DiskStation Manager (DSM)’s online storage expansion and comprehensive storage management tools simplify initial configuration and management. ccelerates recovery from hardware failures and maintains maximum system resilience with SAS multipathing. The system can reroute data in the event of a main interface or connection failure, all thanks to alternate physical paths.

Each of the expansions and the original HD6500 arrives with a dual PSU architecture too, eliminating power supplier failures causing inadvertent complications in the greater storage array when in operation at this scale (with replacement being possible without powering the system down).

Synology RX6022sas Expansion Specs
number of disk slots 60
Compatible Disk Types 3.5″ SAS HDDs
Maximum Internal Net Gross Storage Capacity 960 TB (16 TB drive x 60) (capacity will vary with RAID type)
Disk hot-plug support Yes
External port
expansion port 2
Size (HXWXD) 176mm x 438mm x 985mm
Size (H x W x D) (with chassis brackets) 176mm x 482mm x 1020mm
weight 33.9 kg
Rack Mount Support* Four Post 19″ (Synology Rack Kit – RKS-03 )
Power supply
Power auto-recovery Sync with Synology RackStation
Power Supply / Transformer 1200W
AC input voltage 200V to 240V AC
Power consumption power* 811.8 W (Access)
231 W (Hard Disk Hibernation)
Dual power supply (RP model) Yes
Remark The power consumption test data is obtained when the Synology HAS5300-8T hard drive is fully loaded.
Temperature, Fans and Noise
system fan 80mm x 80mm x 4pcs
Replaceable system fan Yes
Noise value* 61.7 dB(A)

I do wonder if this high-density series from Synology will meld into the existing active-active controller ‘UC’ series, as all indications point that this system is not part of that architecture but I think would lend well to that premium architecture later on.

Another notable detail is that the HD6500 arrives with two included Synology SATA SSDs that stores the DSM software, services and entire operating system. This separates the huge 60 bays of SAS storage from the data to day system operations and is a smart move for a system of this scale. These are two Synology SAT5210-480G SSDs (I presume in a RAID 1 configuration for redundancy) and the covered within the 5 year warranty of the HD6500.

Below is a summary of that hardware architecture:

Synology HD6500 Rackstation Hardware
Processor model Intel Xeon Silver 4210R
Number of CPUs 2
processor architecture 64-bit
processor clock 10-core 2.4 (base frequency) / 3.2 (max overclock) GHz
Hardware Encryption Engine (AES-NI) YES
system memory 64GB DDR4 ECC RDIMMs
Pre-installed memory modules 64GB (32GB x 2)
Total number of memory slots 16
Maximum memory capacity 512GB (32GB x 16)
number of disk slots 60
Maximum number of disk slots to install expansion units 300 (RX6022sas x 4)
Multipath I/O Yes
Compatible Disk Types* (See All Supported Disks)
  • 3.5″ SAS HDDs
  • 2.5″ SATA SSD (system hard drive only)
Hot Swapping Yes
DSM Installation The package contains Synology SATA SSD x 2. To check the applicable system hard drive model, please go to the Component Center .
External Ports
RJ-45 1GbE port 2 (Support Link Aggregation / Failover)
RJ-45 10GbE port 2 (Support Link Aggregation / Failover)
management port 1
USB 3.2 Gen 1 port* 2
expansion port 2
Remark In 2019, USB-IF rebranded the standard formerly known as USB 3.0 to USB 3.2 Gen 1.
PCIe expansion
  • 2 x Gen3 x16 slot (x16 link)
  • 2 x Gen3 x8 slots (x8 link)
file system
internal disk
  • btrfs
external disk
  • btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
Remark You can install the exFAT Access package for free from DSM 7.0’s Package Center. If you use DSM 6.2 or earlier, you need to purchase exFAT Access in Package Center.
Dimensions (rack unit) 4U
Size (HXWXD) 176mm x 482mm x 1020mm
weight 37.9 kg
Rack Mount Support* Four Post 19″ (Synology Rack Kit – RKS-03 )
Cooling, Noise and Operation
system fan 80mm x 80mm x 4pcs
fan mode
  • full speed mode
  • low temperature mode
  • silent mode
Replaceable system fan YES
Power auto-recovery YES
Noise value* 60.8 dB(A)
Timer switch YES
wake on lan YES
Power Supply / Transformer 1600W X2
Dual power supply YES
AC input voltage 200V to 240V AC
Current frequency 50/60 Hz, single frequency
Power consumption power* 1025.2 W (Access)
418 W (HDD Hibernation)
British thermal unit 3495.93 BTU/hr (Access)
1425.38 BTU/hr (Hard Disk Sleep)
  • Noise level test environment: Synology HAS5300-8T hard drive in standby state, with two GRAS Type 40AE microphones installed at a distance of 1 meter from the front and rear of the Synology NAS; background noise level: 16.49-17.51 ​​dB(A); temperature: 24.25-25.75 degrees Celsius; Humidity: 58.2-61.8%.
  • The power consumption test data is obtained when the Synology 8TB HAS5300-8T hard drive is fully loaded.
operating temperature 0°C to 35°C (32°F to 95°F)
Storage temperature -20°C to 60°C (-5°F to 140°F)
Relative humidity 5% to 95% RH
Certification body
5 years
Remark The warranty period begins on the date of purchase stated on the purchase receipt. (see more)
RoHS Compliant
package contents
  • Host X 1
  • Synology SATA SSD X 2
  • Rail Kit Sliding: RKS-03 X 1
  • Accessory Pack X 1
  • Power cord X 2
  • Quick Installation Guide X 1

Synology HD6500 Rackmount Software Support

In terms of software, the HD6500 High-Density Server supports the entirety of the tools that Synology offer in DSM, as well as a vat array of 3rd party enterprise services arriving in SaaS that the brand is well known for. Alongside this, the HD6500 can be used as a bare metal synchronized service with many PaaS or form part of an existing hybrid storage system you may already have in your business. However, it is clear that Synology want you to consider their solutions (especially enterprise-grade ones like this) to serve as your primary storage system and integrate their own C2 platform and hybrid services into your business storage environment over multiple sites. The Synology ecosystem is remarkably impressive and simultaneously manages to arrive with a huge high-class business range of services available, whilst arriving at a price point that significantly undercuts the likes of EMC, Netapp and more. It is clear that Synology has huge designs on establishing a big presence in this storage tier, widening it to allow their solutions to be presented as ‘breaking the strangle hold’ that the highest tier providers have, which has allowed them to be largely self-designed in terms of cost and coverage. It’s an interesting move and with their larger SA and UC releases in the last year or so, as well as their flashstations, storage media and the incredible evolution of C2 in such as short space of time – it might just bloody work! Here is the support of DSM and services that is confirmed:

DSM Support on the Synology HD6500
Maximum single storage space capacity*
  • 1 PB (only supports RAID 6 groups)
  • 200TB
Maximum storage space 256
RAID Group Yes
Supported RAID disk array types
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID configuration migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Expandable storage space with larger hard drive
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Add hard disk to expand storage space
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare supports RAID types
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Remark Snapshot Replication, Shared Folder Encryption and Compression will not be available on Peta Volume enabled volumes. For more information on this restriction, see this article .
file service
archival agreement SMB/AFP/NFS/FTP/WebDAV
Maximum number of simultaneous SMB/AFP/FTP connections 6,000
Maximum number of simultaneous SMB/AFP/FTP connections (with expansion memory) 6,000
Windows Access Control List (ACL) integration Yes
NFS Kerberos authentication Yes
  • For data equipped with expanded memory, all memory slots have been installed with the maximum supported memory capacity during the test.
  • Test criteria are based on the maximum number of simultaneous connections supported by this model. During the test, 25% of the connections were simultaneously transferring files. The transfer process only ensures that the connection is not interrupted, and the minimum transfer speed cannot be guaranteed.
Accounts and Shared Folders
Maximum number of local user accounts 16,000
Maximum number of local groups 512
Maximum number of shared folders 512
Maximum Shared Folder Sync Tasks 32
Hybrid Share
Maximum number of Hybrid Share folders 30
Remark For more details on the maximum number of folders for Hybrid Share, see this article .
high availability
Synology High Availability Yes
log center
Logs received per second 6,000
Virtualization Support
VMware vSphere with VAAI Yes
Windows Server 2016 Yes
Windows Server 2019 Yes
Citrix Ready Yes
OpenStack Yes
General Specifications
Internet Protocol SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
supported languages English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, Japanese, 한국어, Traditional Chinese, Simplified Chinese
Remark For details on supported browser versions, please refer to the DSM Specifications .
Add-on Packages View Full Package List
Antivirus by McAfee (Trial)
Central Management System
Synology Chat
Maximum number of people online at the same time 500
  • Simulation of user environments, measured with an average of 20,000 messages, emojis, or stickers per user, requires less than ten seconds of server response time.
  • Where applicable, the system is tested with maximum memory installed and set to allow the maximum number of simultaneous connections.
SAN Manager
Maximum number of iSCSI Targets 256
Maximum number of LUNs 512
LUN Clone/Snapshot, Windows Offload Data Transfer (ODX) Yes
Synology MailPlus / MailPlus Server
Number of free email accounts 5 (Additional purchase license is required to have more email accounts)
Maximum number of people online at the same time 800
server maximum performance 2,895,678 emails/day, about 85 GB
  • For models with expandable memory, the memory with the maximum capacity has been installed during the test.
  • In high-availability mode, the performance of the mail system is slightly reduced due to data synchronization between the two servers.
  • In all the above tests, the activated functions include: anti-spam, antivirus, DNSBL, greylisting, content scanning, full-text search (English only).
Snapshot Replication
The maximum number of snapshots supported by a single shared folder 1,024
The maximum number of system snapshots 65,536
Surveillance Station
Maximum number of camera support channels (requires installation of camera authorization) 150 (with 2 free licenses) (check compatible IP cameras)
Frames per second (FPS) (H.264) 4500 FPS @ 720p (1280×720)
2800 FPS @ 1080p (1920×1080)
1280 FPS @ 3M (2048×1536)
850 FPS @ 5M (2591×1944)
600 FPS @ 4K (3840×2160)
Frames per second (FPS) (H.265) 4500 FPS @ 720p (1280×720)
4500 FPS @ 1080p (1920×1080)
2700 FPS @ 3M (2048×1536)
1500 FPS @ 5M (2591×1944)
1120 FPS @ 4K (3840×2160)
  • The maximum number of IP cameras and FPS figures are obtained when the test rig is continuously recording with a full hard drive.
  • Actual system capabilities will vary based on system configuration, hard drive performance, number of features enabled, and presence of other workloads.
  • During the test, the number of SAS HDDs has been added to the upper limit supported by this model, and the configuration is RAID 5.
Synology Drive
Recommended number of clients that can be synchronized at the same time 2,000 (The number of devices that can be connected at the same time when the recommended number of files is reached)
Recommended number of files to store 100,000,000 (applicable to index or files belonging to Synology Drive , files accessed through other protocols, please refer to the file service in the above field)
  • Exceeding the recommended quantities above will not cause the kit to stop functioning, only longer response times.
  • For models with expandable memory, the memory with the maximum capacity has been installed during the test.
  • The Btrfs file system and unencrypted shared folders were used in the above tests.
Synology Office
maximum number of users 3,400
  • Test opening multiple files, each edited by 30 users simultaneously.
  • For models with expandable memory, the memory with the maximum capacity has been installed during the test.
  • Client performance may affect the maximum number of simultaneous editing users. Client Test PC Specifications: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager
Recommended number of virtual machines 40 (see more)
Recommended number of Virtual DSMs (license required) 40 (including 1 free license)
Remark This specification varies by system configuration and amount of memory.
VPN Server
Maximum number of connections 60


Synology HD6500 6-Bay Rackmount NAS – Price and Release Date

As mentioned in the introduction, I spent quite a while thinking that this system was never going to be released at all, so now that I know that the Synology HD6500 is REAL and is genuinely coming, I can imagine that the brand will not want to rush this. It is a remarkably niche piece of kit and aside from the price tag almost certainly arriving in the 5 figures, this is not a system that you would release in a consumer period of the year. This is a very different system, even compared to 90% of Synology’s portfolio and I would class this in a very select category alongside unique pieces such as the UC3200 Active/Active unified system and DVA3221 DVA Surveillance NAS. I DO think it will see a 2022 release however. I would also wonder about if/how the 60-Bay RX6022sas expansion chassis will be marketed, as it might well be supported by other Synology Rackstation NAS systems in their portfolio.




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      21 thoughts on “The Synology HD6500 60-Bay Rackmount NAS IS FINALLY COMING!

      1. Can I use WD UltraStar HC550 18 TB SATA Drives in the Synology HD6500 SAS Chassis?
        Looking to purchase one of these if I can put SATA Drives instead of SAS Drives into this Chassis.

      2. Hi gang! A MASSIVE amount of new information has arrived on the HD6500 hardware architecture, software support, expansion deployment and more. I have updated the news article with info and images, so you can find it here –

      3. I’m surprised that this only comes with 2 10gbit ports. For something with this much storage, I would have expected more, as I expect the network card is probably going to be the bottleneck

      4. From an integration pov this might be interesting. Outside of that, one can do _much_ better $/TB-wise w/any roll-your-own hw w/TrueNAS and readily available Dell MD3060E units off of eBay. Dual path standard external SAS 60 bay (5 12 drive trays). Further, the above can be had now, whereas who knows how much longer Synology is going to bake the hd6500.

        Will be neat as a curiosity though.

      5. I know a company that rents out camera systems for training ai systems (think self driving cars) tha can collect 200tb of data every 24 hrs of operation

        There’s a 6-8 month waiting list to rent the system

        The demand is there. If you’re paying that much to collect the data you’ve got triplicates of everything

      6. Love your passion for these mythical beasts! This one unit has more drive slots than Synology has its own branded HDD ???? would be a monster even just to put slower and high capacity 3.5 SSD

      7. Really like your in depth videos.

        What are your thoughts on Ultrastar vs Exos (18tb) drives for a Truenas build?
        The Ultrastar drives are slightly more expensive where I live.
        Wondering how they compare in regards to power consumption, performance, reliability etc.